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These photos were taken using a simple trigger and delay
circuit based on a 555 timer IC. Using a laser pointer and a photodiode as
the trigger, the delay circuit was calibrated to activate the flash at the
precise moment when the splash was forming. The process of calibrating the
delay circuit is a simple process of turning out the light, and letting
the milk drip, while adjusting the delay with a potentiometer. Each time a
drop passes through the laser beam, the flash is activated, and you can
actually see the position of the drop. Because the surroundings are dark,
and the impulse of light produced by the flash is so short, you actually
see a frozen image of what your photo will look like. It's easy, then to
adjust the delay to get the picture you're looking for. |
